Siren rotor



Feb. 17, 1931. H. MILES SIRENROTOR Filed Aug. 9,1930

INVEN TOR. LESTER H.M1L Es.

ATTORNEY.

Patented Feb. 17, "1931 SIRE-N no'ron'i Original application filed August 20,

1929, Serial No. 387,247. :Divided as this application. filed August This invention relates to a siren.

The general object ofthisinvention is to provide an alarm or signal device in which an improved rotor having a forwardly open pocket is employed. I

Other objects of the invention will be apparent from the following description taken in connection with the accompanying drawings wherein: I a

Fig. 1 is a central'longitudinal section of my improved siren.

Fig. 2 is a sectionon line 22 of Fig. 1. Fig. 3 is a section of the rotor on line 33 of Fig. 2.

Fig. 41 is a view similarto Fig. 2 showing a modification and Y Fig. 5 is a section of the rotor on line 55 of Fig. 4. V

This application is a division of and addi 20 tion to my co-pending application Serial No. 387,247, filed Aug. 20,1929. Referring to the drawings by reference characters I have indicated my invention as embodied in a siren indicated generally at 25 10. As shown in the drawings the siren comprises a casing indicated generally at 11. This casing includes a hollow cylindrical body portion 12 and a cover plate 13having a reduced hollow cylindrical hub or port member 1 1 thereon. Thebody 12 is also provided on its outer periphery with a plurality of spaced apertures or" ports 15 as clearly shown in Figs. 1 and 2, and a hollow boss 16, the function of which will be later described. Mounted withinthe body 12 is a rotor 17 This rotor comprises a flat circular rear plate 18 provided at its center-with a curved hub 19 and on its outer periphery with a plurality of short, arcuate spaced flange segments 20.

ments 20 I provide a circular disk 18 which is approximately the same diameter as the back plate 18 and is provided with a central aperture 18".

vane preferably comprises a short curved portion 22 and a longer curved portion 23 with the end of the portion 23 spaced from the baseof the curved hub 19. The vanes 22 50 are preferably of uniform height throughout Connecting the front edges of the flange seg- From the trailing end of each 7 vane 33 is attached to each segment 31 be flange 20 a vane 21 extends inwardly. Each tween the body thereof. Each vane comprises FICE LESTER I-I. MILES, or nos AiiEilns, caLIronnIA and they are curved outwardly so that the portion 21iis ahead when the rotor; is rotated.

'The. constructionis such that when the rotor 17is' revolvedthe vanes 21 force the airy outwardly from ithefcenter through'the aper tures theend of the flanges 20 and through the ports 15 of the casing. forced outwardly and'the ports 16 are intermittently opened and closed by the, rotor flanges 20 a loud noise isproduced; The absen'ceof connection between the vanes and the hub 19 and the shape and arrangement of the vanes, all combine to lessen the resistance as the rotor revolves while increasing the volume of sound produced.

The spacing of the ends of the vanes from the hub/19 also allows moredairto enter the chamber between the vanes and thus a greater quantity of air may be forced out through the ports 15, thereby producing a much As the air :is

function which augments the soundpro The rotor17 isshownas mounted on ashaft 2 5." This shaftiis provided with-suitable bearings 26 and 27 fitted Within the boss 16 of the casing. The shaft V has an enlarged flange 28 thereonwhich engagesthe bearing f 27. The shaft 25 and the. rotor may be secured together as by a nut 29.- 7 is The rotor 17 is shown in the drawings as adapted to be driven by a disk SOWhitzlrmay be a'djustably mounted on the sh'a'ftf25 :as shown. The rotor may, however, be driven inrany other desired manner. 7

In Figs. 1 and 5 I show a siren wherein the casing 12 is similar to the casing 12. In this modification the rotor 30 has peripheral flange segments 31' thereon and a hub-32. A

a straight portion 34 and a curved portion 35 which terminates short of the hub 32. The

37 therein produces a loud sound when the rotor is turned.

From the foregoing description it will be apparent that I have invented an improved siren which is highly eflicient and which can be economically manufactured.

Having thus described my invention, I claim:

1. In a siren including a casing having a rotor mounted thereon, said rotor including a base plate having spaced flange sections thereon, a vane extending from a trailing portion of certain of said flange sections, each of said vanes comprising an inwardly extending portion and a forwardly projecting portion to form a forwardly open pocket.

2. In a siren, a casing, a rotor in said casing, a plurality of flange portions on said rotor, a plurality of vanes associated with said flanges, said vanes being connected to a trailing portion of said flange portions to.

form forwardly open pockets.

3. In a siren, a casing, a rotor mounted in said casing, said casing having peripheral apertures therein, said rotor having spaced flange segments thereon, a vane extending from the rear portion of certain of said segments to provide forwardly opening pockets.

4; In a siren, a casing, a rotor in said casing, said rotor including a base plate having spaced flange sections thereon, a vane extending from a rear portion of said flange sections, said vanes comprising a short U- shaped portion and a longer curved portion connected to said U-shaped portion.

5. In a siren, a casing, a rotor in said casing, said rotor having-spaced flange sections and a vane extending from a location in the rear of the front end of certain of said flange sections whereby a forwardly open pocket is formed.

6. In a siren, a casing, a rotor, said rotor including a plate having spaced flange sections thereon and a vane extending from the rear end of certain of said flange sections, said vanes being arranged to form a forwardly open pocket in conjunction with said flange sections, the inner end of said vanes being arranged to lead when the rotor is rotated.

In testimony whereof, I hereunto aflix my signature.

LESTER H. MILES. 

